Take-up mechanism for sewing-machines.



l fw. A. MACK. TAKE-UP MEGHANISM FOR SEWING MACHINES.

APPLICATION FILED MAY 10, 1911.

Patented Feb.18,1913.

3 SHEETS-SHEET 2.

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h A TTOR/VEY W. A. MACK. TAKLUP MEGHANISM POR SEWING MACHINES.

APPLICATION FILED MAY 10, 1911.

3 SHEETS-SHEET 3.

By V

Patented Feb. 18, 1913.

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, A-WUJLIAM- A. MACLOF cLEvELAND, oriio,A ASSIGNQRITO 'r-HE STANDARD SEWING' .MACHINE c oMPANY, o1? cLEvELANn-oird n CORPORATION oF oHIo.

"TnKE-UP MECHANISM ron SEWING-MACHINES;

To all whom 1 5 may concern:

Be itknown that I, vWILLIAM A. MACK,

i citizen of the United States, and resident of Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Take-Up Mechanism for Sewing-Machines, of which 'A t-he following is'a specication.

My invention has for its object to' provide an improved take-up mechanism -for use in high-speed sewing machines of the type employing a rotary loop-taker which has a plurality of revolutions to each reciprocation of the needle.` lVhen a machine of this type is operated at a very high rate of speed,

` say .at a speed suliicient to` produce about four thousand'stitches and upward per minuteas does the machine embodying my in ven-tio-n and as a consequence of which the loop-taker is operated to havedouble'that number of revolutions, it is obviously necessary that the thread be positively 'controlled #inlits relation to the cooperating stitch- ...forming devices and particularly in its relation to the loop-taker in order that -perfect stitchingmay be made. Heretofore in this type of machine, on account of, the excessive speed of the loop-taker in making its plurality of revolutions to each recipro-v, cation of the needle, the needle thread loop after being cast off by the loop-'taker has not been drawn by, the take-up above the path ance with my invention, however, the takeup is operated to draw the thread loop above the path of movement of the .loop-'taker -priorto the latter reaching loop-taking po sition lfollowing its cast-off of the loop, or

in other words, prior to thev loop-taker completing its first or loop-engaging revolution, whereby the necessity fort-he use of gaurds,etc., as referred to, is avo1ded. Thls and particularly n described in connection v with movement of the loop-taker at such time. In accord-l ther .features of my invention notV hereinbefore'ieferred to will-be hereinafter the front end of said crank-pin 11 1s an v Specification of Letters Patent; Patenfd Feb, 18, 1913, Application tiled May 10, 191,1. Serial No. 626,185.

the accompanying-drawings forming part of i .this specification, in -which- Figures l, 2, 3, and l-are front end elevations'of a sewing machine embodying my the bed-plate in section, showing the relative positions of the take-up and'loop-taker and theircoperating parts at different times during the operation of the machine,

invention, with the face-plate removed and and Fig, 5 is a sectional front side elevation A of the machine, with the frontfendofthe army'at the krear off-thev face-plate inl s ection on line 5 5 of Fig.'2 to show .the relative positions ofthe take-up and its actuating' means, andgvvith the rear en`d of theA arm broken f away to show tl .connections bev tween the upper driving shaft and the lower loop-taker shaft. 1 I

Similar reference characters designate like partsin theseveral figures of the drawings.

The sewing machinehere shown towhichr my invention is vapplied is substantially the l same'as that made the subject-matter vof my pending application, Serial No. 557,339, and it comprises aframe. formedby the usual bed-plate 1 and overhanging braeketsarm 2, a vertically reciprocating needle-bar 3 mounted in the front end of said bracket-- arm, a horizontally arranged driving shaft 4 mounted in bearings in the upper-part of said bracket-arm and hav-ing operative connection at its front end with the needle-bar and at its rear end having, a drive pulley 5,

a loop-taker shaft 6 at the under side vof the bed-plate having attached thereto at its front end a loop-taker '(,and a drive belt 8 operatively connecting 4the shafts 4 4and 6 1 by engagement with sprocket wheels 4f; and

6 thereon,the said wheels being so';:pro-I port-ioned as to cause' two rotations of the-1 lower shaft' 6 to each rotation of the upper shaft i and thereby two revolutions ofthe loop-taker, operated by :said lower shaft, to

each complete reciprocation ofthe needlebar, operated `b v 'said upper shaft.

The driving shaft 4 isprovided atiitslA front end with a crank l10 having a rigidly attached crank-pin 11 which connects Wlth the needle-bar to impart' reciprocating movement -thereto throughA the medium of.

the usual pitman 12. Rigidly. connected to from 'in the direction ofmovement'ot thet arm 13 Awhich extends rearwardly there;v

crank and is provided at its rear end with a crank-pin 14 for operathjeconnection with'- the take-up i'n ,a manner to be presently described. This crank-pin 14 is located a 'distance of about ninety degrees in theiarc i ,of a Acircle about t-he' axis of the crank 41-0' ranged to move in supported and moved thereby.'

By means of the construction,

from the.crank -pin;11,and by reason of.its rigid connection with the crank' 10, is of course moved-byand4 with thelatter.

The-' takeup lever, indicated at v15, is araplane parallel with the' face of the crank 10 and is here shown in the'form o fa straight rod tinedly connected at one end with,` a sleeve 16 pivotedV tothe frame of the machine at 17, and atits opposite end being provided with a forwardlyprojecting arm or Vextension 18 having an eye-therein for receiving the needle-thread y t at a point forward of t-he faceplate as shown. Betweenits said' ends the take-up -lever is engaged by a sleeve19 which'has' a slidable connection therewith and is pivot-.- ally connected with the crank-pin- 14 t'obe arrangement and organization ot' the take-up -and associated parts as described and shown,l which includes the location -ot' the take-up fulcrum 17 in a posit-ion aft-one side of the axis of the crank 10 and in 'substantially the same horizontal-,plane therewith and also the engagement of, the take-.up lever with 'its supporting sleeves 16 and 19 at one side ofv their axis otmovement, the take-up' iscaused to positively and accurately control the thread when t-he machine is beingl operated at the high speed hereinbefore refer-red to, in substantially thema-nner shown in Figs. 1 to 4 inclusive of the drawings, inV which Fig. 1 shows the relative positions of the take-up, needle and loop-taker and the control of the needle-thread by said Vtake-'up at the time the point of the looptaker is entering or takingthe thread-loop fromthe needle; Fig. 2, the relative posi- Ations of the same parts when' the thread -loop Z is `about to be cast ot'f' by the loop-v taker and drawn up by the take-up; Fig. 3, the relative positions of the same' parts at the time-the loop-taker has completed ,its

take-up lever substantially from end to end thereof, whereby the required differential or fast and slow movement is'imparted to greatest strain, 'den ierk on lthe thread such as might 'tend 'ing said takeup the take-upfor'its proper handling of the thread,'that. is, a' slow downward movement ofthe take-up-in. giving down the'thread rcqulred bythe loop-taker in passing or ex- Vtending the:th`re adloop4 about the bobbincase, 'and a st ibsequeut quick upward movement of theiake-up to draw the threadloop,

'as particularly required inth'epresent case,

above.' taker prior to. the latter` beginning' its secondor'i'dle revolution. In- 'so operating the V take-up',''th'e organization-'of its actuating.'

'mechanism issuchthat its speed 'of move ment isflessened as 1t 'approaches 'the limit 'of its up-'strokein tightening' and-setting vthe'stitcin atwhich'time the 'thread .is under in order to'av'oid any sudtobreakjthe same. l lVha't I clam1is:- 1. In a sewing machine, the combination 'with avreciprocatingneedle, a rotary loop- .taker '-operative '1n a vertical piane, an

means for giving-said loop-taker-a 'plurality of revolutions to each 'reciprocationof the needlefof a take-up,'.and means for `operatthe .loop-taker todraw `said loop above the path'of movement'of the loop-taker prior to the'latter reaching loop-.taking positlon at the. completion ofthe rs't of its said plurality .ofrevolutions.

. 2. In asewing machine,tl1'e combination ywith a reciprocating needle, a rotary looptaker operative 'in a -vertical plane, and means for giving said'lo'op-taker a plurality of revolutions to each reciprocation ofl the needle, of a vibrating take-up, and' means for operating said take-up to increase'- its speed after Lthe' casto of the 'thread loop to' increase the speed there- `of aft-er thecast-oii' of-the threadloop by by the loop-'taker to draw said loop above the pathjof movement of the Aloop-takin priorto the'latter reaching loop-takingposition at-the completion of the first of its said plurality of revolutions.

3.- In a sewing machine,-thecombination with a reciprocating -needle-bar and its needle, a revoluble. crank .operatively connected 'with said needle-bar to.- actuate the same, a rotary loop-'taker operative in a vertical plane, and'means for giving said loop-taker a plurality of revolutions-to each reciprocation of the needle, of a pivoted take-up, and connections between the revoluble crank and said take-upfor operating the latter to increase its'speed after the cast-off of the thread loop by the loop-taker to draw said 'loop above the path of movement of the loop-taker'prior to the latter reaching loopj dle, `a revolublecrank carrying two crankj I pins .one of which is operatively connected atl-one side 'of the axis of said crank and in substantially the same .horizontal plane therewith, and a take-up lever supported by said"sleeves and having a fixed. connection 4withone anda slidable connection y with the: other; said parts being constructed, arranged, andl organized whereby the take-up will operate after. the cast-ott of the thread loop' by the loopftaker to draw said loop above. the path ot' movement of the looptaker prior to the latter reaching'loop-takingpositionat the completion of the irst of its said plurality of revolutions.

y 5. In a sewing machine'andinA combina tion, a reciprocating needle-bar and its needle, a revoluble crank carrying two cranky pins one .of which is located in advanse of Y the other in their direction of .rotation and is operatively connected with the Aneedle-bar to actliate the saine7 a rotary loop-taker operative in a vertical plane, means for giving said loop-taker a' plurality of revolutions `to each reoiprocation ot the needle7 two sleeves, one being pivoted to the second or rearwardly located crank-pin of the 'revoluble crank to bev moved therewith and the.

other being pivoted to a. stationary support at one side ofthe axis of said crank and in substantlally the same horizontal plane therewith, and a straight take-up lever sup-' ported by said sleeves at' one side of their 'axis of movement and having a iixed connection at one end with one-and a slidable. connection between itsends with the other; said. parts being constructed, arranged and 'organized whereby the crank-supported sleeve will be caused to slide from end to end of the take-up lever and operate the latter to control the thread with respect to the cooperating stitch-forming devicesyand in so doing, operate after the cast-oill of the thread loop by the loop-taker to draw said loop above the path of movement of the loop-talter prior'to the latter reaching loop-k taking position at thek Completion of theirstjof its said plurality of revolutions.

Signed Yat Cleveland, in the county of of May A. 1).'1911.. y

WILLAM A. MACK. Witnesses: CEAS. C. EMMoNs, S. K.r BRINEY.

Cuyahoga and State of Ohio,this lst day p l 

